CVE entry · CVE-2026-3055
CVE-2026-3055: Citrix NetScaler Out-of-Bounds Read Vulnerability
Citrix NetScaler ADC (formerly Citrix ADC), NetScaler Gateway (formerly Citrix Gateway) and NetScaler ADC FIPS and NDcPP contain an out-of-bounds reads vulnerability when configured as a SAML IDP leading to memory overread.
- Actively exploited: added to CISA’s KEV catalog on March 30, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: April 2, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Citrix NetScaler, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (support.citrix.com)
- NVD entry (NIST)
- CISA KEV catalog
Other Citrix vulnerabilities
-
Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
-
Citrix NetScaler Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
-
Citrix NetScaler Improper Input Validation Vulnerability
-
Citrix NetScaler Authentication Bypass Using an Alternate Path or Channel Vulnerability
-
Citrix NetScaler ADC and NetScaler Gateway Improper Restriction of Operations within the Bounds of a Memory Buffer Vulnerability
-
Citrix NetScaler Memory Overflow Vulnerability